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/*
 * Copyright (C) 2017 CenturyLink, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.centurylink.mdw.service.rest;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.ws.rs.Path;

import org.json.JSONException;
import org.json.JSONObject;

import com.centurylink.mdw.cache.CachingException;
import com.centurylink.mdw.common.service.ServiceException;
import com.centurylink.mdw.common.service.types.StatusMessage;
import com.centurylink.mdw.dataaccess.DataAccessException;
import com.centurylink.mdw.model.user.Workgroup;
import com.centurylink.mdw.model.listener.Listener;
import com.centurylink.mdw.model.user.Role;
import com.centurylink.mdw.model.user.User;
import com.centurylink.mdw.model.user.UserAction.Entity;
import com.centurylink.mdw.service.data.user.UserGroupCache;
import com.centurylink.mdw.services.ServiceLocator;
import com.centurylink.mdw.services.UserServices;
import com.centurylink.mdw.services.rest.JsonRestService;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;

@Path("/Workgroups")
@Api("MDW user workgroups service")
public class Workgroups extends JsonRestService {

    @Override
    public List getRoles(String path, String method) {
        if (method.equals("GET")) {
            List roles = new ArrayList<>();
            if (UserGroupCache.getRole(Role.ASSET_VIEW) != null) {
                roles.add(Role.USER_VIEW);
                roles.add(Role.USER_ADMIN);
                roles.add(Workgroup.SITE_ADMIN_GROUP);
            }
            return roles;
        }
        else {
            List roles = super.getRoles(path);
            roles.add(Role.USER_ADMIN);
            return roles;
        }
    }

    @Override
    protected Entity getEntity(String path, Object content, Map headers) {
        return Entity.Workgroup;
    }

    /**
     * Retrieve a workgroup or all workgroups.
     */
    @Override
    @Path("/{groupName}")
    @ApiOperation(value="Retrieve a workgroup or all workgroups",
        notes="If groupName is not present, returns all workgroups.",
        response=Workgroup.class, responseContainer="List")
    public JSONObject get(String path, Map headers)
    throws ServiceException, JSONException {
        UserServices userServices = ServiceLocator.getUserServices();
        try {
            String groupName = getSegment(path, 1);
            if (groupName == null) // check parameter
                groupName = getParameters(headers).get("name");
            if (groupName != null) {
                Workgroup group = userServices.getWorkgroup(groupName);
                if (group == null)
                    throw new ServiceException(ServiceException.NOT_FOUND, "Workgroup not found: " + groupName);
                return group.getJson();
            }
            else {
                return userServices.getWorkgroups().getJson();
            }
        }
        catch (ServiceException ex) {
            throw ex;
        }
        catch (Exception ex) {
            throw new ServiceException(ex.getMessage(), ex);
        }
    }

    /**
     * For creating a new workgroup or a new group/user relationship.
     */
    @Override
    @Path("/{groupName}/users/{cuid}")
    @ApiOperation(value="Create a workgroup or add a user to an existing workgroup",
        notes="If users/{cuid} is present, user is added to workgroup.", response=StatusMessage.class)
    @ApiImplicitParams({
        @ApiImplicitParam(name="Workgroup", paramType="body", required=true, dataType="com.centurylink.mdw.model.user.Workgroup"),
        @ApiImplicitParam(name="groupName", paramType="path", required=true)})
    public JSONObject post(String path, JSONObject content, Map headers)
    throws ServiceException, JSONException {
        String name = getSegment(path, 1);
        String rel = getSegment(path, 2);

        UserServices userServices = ServiceLocator.getUserServices();
        try {
            if (rel == null) {
                Workgroup workgroup = new Workgroup(content);
                Workgroup existing = userServices.getWorkgroups().get(workgroup.getName());
                if (existing != null)
                    throw new ServiceException(HTTP_409_CONFLICT, "Workgroup name already exists: " + workgroup.getName());
                userServices.createWorkgroup(workgroup);
                headers.put(Listener.METAINFO_HTTP_STATUS_CODE, "201");
            }
            else if (rel.equals("users")) {
                String cuid = getSegment(path, 3);
                User user = UserGroupCache.getUser(cuid);
                if (user == null) {
                    throw new CachingException("Cannot find user: " + cuid);
                }
                if (user.belongsToGroup(name))  // in case added elsewhere
                    throw new ServiceException(HTTP_409_CONFLICT, "User " + cuid + " already belongs to workgroup " + name);

                userServices.addUserToWorkgroup(cuid, name);
            }
            else {
                String msg = "Unsupported relationship for workgroup " + name + ": " + rel;
                throw new ServiceException(HTTP_400_BAD_REQUEST, msg);
            }
            return null;
        }
        catch (DataAccessException ex) {
            throw new ServiceException(HTTP_500_INTERNAL_ERROR, ex.getMessage(), ex);
        }
        catch (CachingException ex) {
             throw new ServiceException(HTTP_500_INTERNAL_ERROR, ex.getMessage(), ex);
        }
    }

    /**
     * For update.
     */
    @Override
    @Path("/{groupName}")
    @ApiOperation(value="Update a workgroup", response=StatusMessage.class)
    @ApiImplicitParams({
        @ApiImplicitParam(name="Workgroup", paramType="body", required=true, dataType="com.centurylink.mdw.model.user.Workgroup")})
    public JSONObject put(String path, JSONObject content, Map headers)
    throws ServiceException, JSONException {

        UserServices userServices = ServiceLocator.getUserServices();
        String name = getSegment(path, 1);
        if (name == null)
            throw new ServiceException(HTTP_400_BAD_REQUEST, "Missing path segment: {name}");
        if (!content.has("name"))
            throw new ServiceException(HTTP_400_BAD_REQUEST, "Missing required property: name");
        Workgroup workgroup = new Workgroup(content);
        try {
            Workgroup existing = userServices.getWorkgroup(name);
            if (existing == null)
                throw new ServiceException(HTTP_404_NOT_FOUND, "Workgroup not found: " + name);
            // update
            workgroup.setId(existing.getId());
            userServices.updateWorkgroup(workgroup);
            return null;
        }
        catch (DataAccessException ex) {
            throw new ServiceException(HTTP_500_INTERNAL_ERROR, ex.getMessage(), ex);
        }
    }

    /**
     * Delete workgroup or remove user from group.
     */
    @Path("/{groupName}/users/{cuid}")
    @ApiOperation(value="Delete a workgroup or remove a user from a workgroup",
        notes="If users/{cuid} is present, user is removed from workgroup.", response=StatusMessage.class)
    public JSONObject delete(String path, JSONObject content, Map headers)
    throws ServiceException, JSONException {
        String name = getSegment(path, 1);
        String rel = getSegment(path, 2);

        UserServices userServices = ServiceLocator.getUserServices();
        try {
            if (rel == null) {
                Workgroup workgroup = userServices.getWorkgroup(name);
                if (workgroup == null)
                    throw new ServiceException(ServiceException.NOT_FOUND, "Workgroup not found: " + name);
                userServices.deleteWorkgroup(name);
            }
            else if (rel.equals("users")) {
                String cuid = getSegment(path, 3);
                userServices.removeUserFromWorkgroup(cuid, name);
            }
        }
        catch (DataAccessException ex) {
            throw new ServiceException(HTTP_500_INTERNAL_ERROR, ex.getMessage(), ex);
        }
        return null;
    }
}




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